Date与LocalDateTime/LocalDate/LocalTime互转工具类

Date与Java8的时间之间的相互转换必须通过一个中间类Instant。

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.*;
import java.time.format.DateTimeFormatter;
import java.util.Date;

/**
 * 日期转换工具类
 *
 * @author Lenovo
 */
public class DateUtil {

    public static LocalDateTime date2LocalDateTime(Date date) {
        Instant instant = date.toInstant();
        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
    }

    public static LocalDate date2LocalDate(Date date) {
        Instant instant = date.toInstant();
        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalDate();
    }

    public static LocalTime date2LocalTime(Date date) {
        Instant instant = date.toInstant();
        return LocalDateTime.ofInstant(instant, ZoneId.systemDefault()).toLocalTime();
    }

    public static Date localDateTime2Date(LocalDateTime localDateTime) {
        Instant instant = localDateTime.atZone(ZoneId.systemDefault()).toInstant();
        return Date.from(instant);
    }

    public static Date localDate2Date(LocalDate localDate) {
        Instant instant = localDate.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant();
        return Date.from(instant);
    }

    public static Date localTime2Date(LocalTime localTime) {
        Instant instant = LocalDateTime.of(LocalDate.now(), localTime).atZone(ZoneId.systemDefault()).toInstant();
        return Date.from(instant);
    }

    public static LocalDateTime parseString2LocalDateTime(String str, String pattern) {
        if (pattern == null) {
            DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
            return LocalDateTime.parse(str, df);
        }
        return LocalDateTime.parse(str, DateTimeFormatter.ofPattern(pattern));
    }
    //解析带T的时间字符串
    public static Date parseString2Date(String str) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd\'T\'HH:mm:ss");
        Date date = sdf.parse(str);
        return date;
    }

    public static String second2hour(long time) {
        int temp = (int) time;
        int hh = temp / 3600;
        int mm = (temp % 3600) / 60;
        int ss = (temp % 3600) % 60;
        return (hh < 10 ? ("0" + hh) : hh) + "时" +
                (mm < 10 ? ("0" + mm) : mm) + "分" +
                (ss < 10 ? ("0" + ss) : ss) + "秒";
    }

}

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